A first difficulty arises as the very notion of `production' seems to involve some form of asymmetry in one way or another; as we have seen in §REF , that's precisely one of the principal reasons for [1]} to consider the direction of time as fundamental (see footnote REF ). But such primitive temporal directionality is obviously not appropriate in quantum gravity and there is no guarantee that a non-temporal asymmetry obtains in this context. Within the framework of causal set theory, sequential growth—the `birthing process' of new elements—may well encode some not explicitly temporal asymmetry (which may help to ground some generalized version of becoming, at least within classical sequential growth—not without its own set of challenges though, see [2]} and [3]}).
